No. As they left, they turned the fumigators on. Like others, I was surprised that they didn't pack the equipment up before starting to fumigate, especially the tent which would, theoretically, keep the fumigation from happening properly and block out the poison from entering the tented section inside the house where the lab was set up. It's mainly, though, just a stylistic flourish to show how "boss" Jesse and Walt have become. They don't do the dirty, grunt work.

The nanny cam was spotted by the guy, presumably, as they prepped the house for setting up the lab. Since they're B&E guys, they're likely good at spotting things like that.

__________________In this world of sin and sorrow there is always something to be thankful for; as for me, I rejoice that I am not a Republican.
- H. L. Mencken